Finding the Fourth Proportional to 78,725.60, 108,638.80 and 42,915.04

Step by Step Solution

1. Step 1: Write the proportion equation
   78,725.60 : 108,638.80 = 42,915.04 : x
2. Step 2: Convert to fraction form
   78,725.60/108,638.80 = 42,915.04/x
3. Step 3: Cross multiply
   78,725.60x = 108,638.80 × 42,915.04
4. Step 4: Simplify right side
   78,725.60x = 4,662,238,447.55
5. Step 5: Solve for x
   x = 4,662,238,447.55/78,725.60
6. Step 6: Final answer
   x = 59,221.38