Finding the Fourth Proportional to 138,790.76, 191,534.72 and 85,105.36

Step by Step Solution

1. Step 1: Write the proportion equation
   138,790.76 : 191,534.72 = 85,105.36 : x
2. Step 2: Convert to fraction form
   138,790.76/191,534.72 = 85,105.36/x
3. Step 3: Cross multiply
   138,790.76x = 191,534.72 × 85,105.36
4. Step 4: Simplify right side
   138,790.76x = 16,300,631,298.10
5. Step 5: Solve for x
   x = 16,300,631,298.10/138,790.76
6. Step 6: Final answer
   x = 117,447.53