Finding the Fourth Proportional to 1,185,666.88, 1,778,783.28 and 386,949.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185,666.88 : 1,778,783.28 = 386,949.91 : x
2. Step 2: Convert to fraction form
   1,185,666.88/1,778,783.28 = 386,949.91/x
3. Step 3: Cross multiply
   1,185,666.88x = 1,778,783.28 × 386,949.91
4. Step 4: Simplify right side
   1,185,666.88x = 688,300,030,105.51
5. Step 5: Solve for x
   x = 688,300,030,105.51/1,185,666.88
6. Step 6: Final answer
   x = 580,517.21