Finding the Fourth Proportional to 78,120.71, 107,806.53 and 42,310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,120.71 : 107,806.53 = 42,310.72 : x
2. Step 2: Convert to fraction form
   78,120.71/107,806.53 = 42,310.72/x
3. Step 3: Cross multiply
   78,120.71x = 107,806.53 × 42,310.72
4. Step 4: Simplify right side
   78,120.71x = 4,561,371,905.00
5. Step 5: Solve for x
   x = 4,561,371,905.00/78,120.71
6. Step 6: Final answer
   x = 58,388.77