Finding the Fourth Proportional to 78,638.43, 108,445.60 and 52,855.32

Step by Step Solution

1. Step 1: Write the proportion equation
   78,638.43 : 108,445.60 = 52,855.32 : x
2. Step 2: Convert to fraction form
   78,638.43/108,445.60 = 52,855.32/x
3. Step 3: Cross multiply
   78,638.43x = 108,445.60 × 52,855.32
4. Step 4: Simplify right side
   78,638.43x = 5,731,926,890.59
5. Step 5: Solve for x
   x = 5,731,926,890.59/78,638.43
6. Step 6: Final answer
   x = 72,889.64