Finding the Fourth Proportional to 363,931.31, 546,066.05 and 139,217.47

Step by Step Solution

1. Step 1: Write the proportion equation
   363,931.31 : 546,066.05 = 139,217.47 : x
2. Step 2: Convert to fraction form
   363,931.31/546,066.05 = 139,217.47/x
3. Step 3: Cross multiply
   363,931.31x = 546,066.05 × 139,217.47
4. Step 4: Simplify right side
   363,931.31x = 76,021,933,933.89
5. Step 5: Solve for x
   x = 76,021,933,933.89/363,931.31
6. Step 6: Final answer
   x = 208,890.89