Finding the Fourth Proportional to 497,877.50, 686,967.89 and 291,106.10

Step by Step Solution

1. Step 1: Write the proportion equation
   497,877.50 : 686,967.89 = 291,106.10 : x
2. Step 2: Convert to fraction form
   497,877.50/686,967.89 = 291,106.10/x
3. Step 3: Cross multiply
   497,877.50x = 686,967.89 × 291,106.10
4. Step 4: Simplify right side
   497,877.50x = 199,980,545,728.31
5. Step 5: Solve for x
   x = 199,980,545,728.31/497,877.50
6. Step 6: Final answer
   x = 401,666.16