Finding the Fourth Proportional to 81,603.74, 122,307.18 and 42,139.34

Step by Step Solution

1. Step 1: Write the proportion equation
   81,603.74 : 122,307.18 = 42,139.34 : x
2. Step 2: Convert to fraction form
   81,603.74/122,307.18 = 42,139.34/x
3. Step 3: Cross multiply
   81,603.74x = 122,307.18 × 42,139.34
4. Step 4: Simplify right side
   81,603.74x = 5,153,943,842.46
5. Step 5: Solve for x
   x = 5,153,943,842.46/81,603.74
6. Step 6: Final answer
   x = 63,158.18