Finding the Fourth Proportional to 78,211.20, 107,931.60 and 42,401.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,211.20 : 107,931.60 = 42,401.10 : x
2. Step 2: Convert to fraction form
   78,211.20/107,931.60 = 42,401.10/x
3. Step 3: Cross multiply
   78,211.20x = 107,931.60 × 42,401.10
4. Step 4: Simplify right side
   78,211.20x = 4,576,418,564.76
5. Step 5: Solve for x
   x = 4,576,418,564.76/78,211.20
6. Step 6: Final answer
   x = 58,513.60