Finding the Fourth Proportional to 138,562.76, 191,200.37 and 78,129.81

Step by Step Solution

1. Step 1: Write the proportion equation
   138,562.76 : 191,200.37 = 78,129.81 : x
2. Step 2: Convert to fraction form
   138,562.76/191,200.37 = 78,129.81/x
3. Step 3: Cross multiply
   138,562.76x = 191,200.37 × 78,129.81
4. Step 4: Simplify right side
   138,562.76x = 14,938,448,580.03
5. Step 5: Solve for x
   x = 14,938,448,580.03/138,562.76
6. Step 6: Final answer
   x = 107,809.98