Finding the Fourth Proportional to 308,397.11, 462,538.89 and 139,876.88

Step by Step Solution

1. Step 1: Write the proportion equation
   308,397.11 : 462,538.89 = 139,876.88 : x
2. Step 2: Convert to fraction form
   308,397.11/462,538.89 = 139,876.88/x
3. Step 3: Cross multiply
   308,397.11x = 462,538.89 × 139,876.88
4. Step 4: Simplify right side
   308,397.11x = 64,698,494,499.17
5. Step 5: Solve for x
   x = 64,698,494,499.17/308,397.11
6. Step 6: Final answer
   x = 209,789.56