Finding the Fourth Proportional to 138,870.96, 191,661 and 85,146.48

Step by Step Solution

1. Step 1: Write the proportion equation
   138,870.96 : 191,661 = 85,146.48 : x
2. Step 2: Convert to fraction form
   138,870.96/191,661 = 85,146.48/x
3. Step 3: Cross multiply
   138,870.96x = 191,661 × 85,146.48
4. Step 4: Simplify right side
   138,870.96x = 16,319,259,503.28
5. Step 5: Solve for x
   x = 16,319,259,503.28/138,870.96
6. Step 6: Final answer
   x = 117,513.84