Finding the Fourth Proportional to 78,740.79, 108,663.45 and 42,931.41

Step by Step Solution

1. Step 1: Write the proportion equation
   78,740.79 : 108,663.45 = 42,931.41 : x
2. Step 2: Convert to fraction form
   78,740.79/108,663.45 = 42,931.41/x
3. Step 3: Cross multiply
   78,740.79x = 108,663.45 × 42,931.41
4. Step 4: Simplify right side
   78,740.79x = 4,665,075,123.96
5. Step 5: Solve for x
   x = 4,665,075,123.96/78,740.79
6. Step 6: Final answer
   x = 59,245.98