Finding the Fourth Proportional to 442,828,978.05, 663,986,483.29 and 209,657,732.49

Step by Step Solution

1. Step 1: Write the proportion equation
   442,828,978.05 : 663,986,483.29 = 209,657,732.49 : x
2. Step 2: Convert to fraction form
   442,828,978.05/663,986,483.29 = 209,657,732.49/x
3. Step 3: Cross multiply
   442,828,978.05x = 663,986,483.29 × 209,657,732.49
4. Step 4: Simplify right side
   442,828,978.05x = 139,209,900,488,513,408
5. Step 5: Solve for x
   x = 139,209,900,488,513,408/442,828,978.05
6. Step 6: Final answer
   x = 314,364,929.56