Finding the Fourth Proportional to 78,156.80, 107,856.24 and 42,347.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,156.80 : 107,856.24 = 42,347.72 : x
2. Step 2: Convert to fraction form
   78,156.80/107,856.24 = 42,347.72/x
3. Step 3: Cross multiply
   78,156.80x = 107,856.24 × 42,347.72
4. Step 4: Simplify right side
   78,156.80x = 4,567,465,851.77
5. Step 5: Solve for x
   x = 4,567,465,851.77/78,156.80
6. Step 6: Final answer
   x = 58,439.78