Finding the Fourth Proportional to 138,702, 191,434.72 and 79,086

Step by Step Solution

1. Step 1: Write the proportion equation
   138,702 : 191,434.72 = 79,086 : x
2. Step 2: Convert to fraction form
   138,702/191,434.72 = 79,086/x
3. Step 3: Cross multiply
   138,702x = 191,434.72 × 79,086
4. Step 4: Simplify right side
   138,702x = 15,139,806,265.92
5. Step 5: Solve for x
   x = 15,139,806,265.92/138,702
6. Step 6: Final answer
   x = 109,153.48