Finding the Fourth Proportional to 138,901.17, 191,682.59 and 78,470.72

Step by Step Solution

1. Step 1: Write the proportion equation
   138,901.17 : 191,682.59 = 78,470.72 : x
2. Step 2: Convert to fraction form
   138,901.17/191,682.59 = 78,470.72/x
3. Step 3: Cross multiply
   138,901.17x = 191,682.59 × 78,470.72
4. Step 4: Simplify right side
   138,901.17x = 15,041,470,848.76
5. Step 5: Solve for x
   x = 15,041,470,848.76/138,901.17
6. Step 6: Final answer
   x = 108,289.01