Finding the Fourth Proportional to 142,799.74, 197,085.34 and 91,139.13

Step by Step Solution

1. Step 1: Write the proportion equation
   142,799.74 : 197,085.34 = 91,139.13 : x
2. Step 2: Convert to fraction form
   142,799.74/197,085.34 = 91,139.13/x
3. Step 3: Cross multiply
   142,799.74x = 197,085.34 × 91,139.13
4. Step 4: Simplify right side
   142,799.74x = 17,962,185,437.93
5. Step 5: Solve for x
   x = 17,962,185,437.93/142,799.74
6. Step 6: Final answer
   x = 125,785.85