Finding the Fourth Proportional to 78,748.20, 108,672.57 and 42,938.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,748.20 : 108,672.57 = 42,938.28 : x
2. Step 2: Convert to fraction form
   78,748.20/108,672.57 = 42,938.28/x
3. Step 3: Cross multiply
   78,748.20x = 108,672.57 × 42,938.28
4. Step 4: Simplify right side
   78,748.20x = 4,666,213,238.98
5. Step 5: Solve for x
   x = 4,666,213,238.98/78,748.20
6. Step 6: Final answer
   x = 59,254.86