Finding the Fourth Proportional to 81,875.17, 122,878.95 and 42,443.56

Step by Step Solution

1. Step 1: Write the proportion equation
   81,875.17 : 122,878.95 = 42,443.56 : x
2. Step 2: Convert to fraction form
   81,875.17/122,878.95 = 42,443.56/x
3. Step 3: Cross multiply
   81,875.17x = 122,878.95 × 42,443.56
4. Step 4: Simplify right side
   81,875.17x = 5,215,420,087.06
5. Step 5: Solve for x
   x = 5,215,420,087.06/81,875.17
6. Step 6: Final answer
   x = 63,699.66