Finding the Fourth Proportional to 137,298.21, 189,470.61 and 76,868.61

Step by Step Solution

1. Step 1: Write the proportion equation
   137,298.21 : 189,470.61 = 76,868.61 : x
2. Step 2: Convert to fraction form
   137,298.21/189,470.61 = 76,868.61/x
3. Step 3: Cross multiply
   137,298.21x = 189,470.61 × 76,868.61
4. Step 4: Simplify right side
   137,298.21x = 14,564,342,426.55
5. Step 5: Solve for x
   x = 14,564,342,426.55/137,298.21
6. Step 6: Final answer
   x = 106,078.17