Finding the Fourth Proportional to 59,196.80, 81,615.36 and 42,220.40

Step by Step Solution

1. Step 1: Write the proportion equation
   59,196.80 : 81,615.36 = 42,220.40 : x
2. Step 2: Convert to fraction form
   59,196.80/81,615.36 = 42,220.40/x
3. Step 3: Cross multiply
   59,196.80x = 81,615.36 × 42,220.40
4. Step 4: Simplify right side
   59,196.80x = 3,445,833,145.34
5. Step 5: Solve for x
   x = 3,445,833,145.34/59,196.80
6. Step 6: Final answer
   x = 58,209.79