Finding the Fourth Proportional to 189,139.68, 261,012.72 and 103,098.78

Step by Step Solution

1. Step 1: Write the proportion equation
   189,139.68 : 261,012.72 = 103,098.78 : x
2. Step 2: Convert to fraction form
   189,139.68/261,012.72 = 103,098.78/x
3. Step 3: Cross multiply
   189,139.68x = 261,012.72 × 103,098.78
4. Step 4: Simplify right side
   189,139.68x = 26,910,092,996.48
5. Step 5: Solve for x
   x = 26,910,092,996.48/189,139.68
6. Step 6: Final answer
   x = 142,276.30