Finding the Fourth Proportional to 710,899.96, 981,039.72 and 388,610.16

Step by Step Solution

1. Step 1: Write the proportion equation
   710,899.96 : 981,039.72 = 388,610.16 : x
2. Step 2: Convert to fraction form
   710,899.96/981,039.72 = 388,610.16/x
3. Step 3: Cross multiply
   710,899.96x = 981,039.72 × 388,610.16
4. Step 4: Simplify right side
   710,899.96x = 381,242,002,555.56
5. Step 5: Solve for x
   x = 381,242,002,555.56/710,899.96
6. Step 6: Final answer
   x = 536,280.80