Finding the Fourth Proportional to 143,642.54, 215,391.69 and 83,690.42

Step by Step Solution

1. Step 1: Write the proportion equation
   143,642.54 : 215,391.69 = 83,690.42 : x
2. Step 2: Convert to fraction form
   143,642.54/215,391.69 = 83,690.42/x
3. Step 3: Cross multiply
   143,642.54x = 215,391.69 × 83,690.42
4. Step 4: Simplify right side
   143,642.54x = 18,026,221,000.61
5. Step 5: Solve for x
   x = 18,026,221,000.61/143,642.54
6. Step 6: Final answer
   x = 125,493.61