Finding the Fourth Proportional to 453,039.86, 679,561.96 and 137,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   453,039.86 : 679,561.96 = 137,499.50 : x
2. Step 2: Convert to fraction form
   453,039.86/679,561.96 = 137,499.50/x
3. Step 3: Cross multiply
   453,039.86x = 679,561.96 × 137,499.50
4. Step 4: Simplify right side
   453,039.86x = 93,439,429,719.02
5. Step 5: Solve for x
   x = 93,439,429,719.02/453,039.86
6. Step 6: Final answer
   x = 206,249.91