Finding the Fourth Proportional to 138,534.72, 191,166.39 and 78,120.27

Step by Step Solution

1. Step 1: Write the proportion equation
   138,534.72 : 191,166.39 = 78,120.27 : x
2. Step 2: Convert to fraction form
   138,534.72/191,166.39 = 78,120.27/x
3. Step 3: Cross multiply
   138,534.72x = 191,166.39 × 78,120.27
4. Step 4: Simplify right side
   138,534.72x = 14,933,969,045.89
5. Step 5: Solve for x
   x = 14,933,969,045.89/138,534.72
6. Step 6: Final answer
   x = 107,799.47