Finding the Fourth Proportional to 138,598.72, 191,268.24 and 78,172.24

Step by Step Solution

1. Step 1: Write the proportion equation
   138,598.72 : 191,268.24 = 78,172.24 : x
2. Step 2: Convert to fraction form
   138,598.72/191,268.24 = 78,172.24/x
3. Step 3: Cross multiply
   138,598.72x = 191,268.24 × 78,172.24
4. Step 4: Simplify right side
   138,598.72x = 14,951,866,761.66
5. Step 5: Solve for x
   x = 14,951,866,761.66/138,598.72
6. Step 6: Final answer
   x = 107,878.82