Finding the Fourth Proportional to 78,573.30, 108,427.57 and 42,763.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,573.30 : 108,427.57 = 42,763.20 : x
2. Step 2: Convert to fraction form
   78,573.30/108,427.57 = 42,763.20/x
3. Step 3: Cross multiply
   78,573.30x = 108,427.57 × 42,763.20
4. Step 4: Simplify right side
   78,573.30x = 4,636,709,861.42
5. Step 5: Solve for x
   x = 4,636,709,861.42/78,573.30
6. Step 6: Final answer
   x = 59,011.27