Finding the Fourth Proportional to 437,400.83, 655,151.83 and 212,288.18

Step by Step Solution

1. Step 1: Write the proportion equation
   437,400.83 : 655,151.83 = 212,288.18 : x
2. Step 2: Convert to fraction form
   437,400.83/655,151.83 = 212,288.18/x
3. Step 3: Cross multiply
   437,400.83x = 655,151.83 × 212,288.18
4. Step 4: Simplify right side
   437,400.83x = 139,080,985,807.89
5. Step 5: Solve for x
   x = 139,080,985,807.89/437,400.83
6. Step 6: Final answer
   x = 317,971.47