Finding the Fourth Proportional to 660,018.72, 910,820.49 and 358,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   660,018.72 : 910,820.49 = 358,212.72 : x
2. Step 2: Convert to fraction form
   660,018.72/910,820.49 = 358,212.72/x
3. Step 3: Cross multiply
   660,018.72x = 910,820.49 × 358,212.72
4. Step 4: Simplify right side
   660,018.72x = 326,267,485,154.63
5. Step 5: Solve for x
   x = 326,267,485,154.63/660,018.72
6. Step 6: Final answer
   x = 494,330.65