Finding the Fourth Proportional to 78,155.80, 107,854.86 and 42,346.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,155.80 : 107,854.86 = 42,346.72 : x
2. Step 2: Convert to fraction form
   78,155.80/107,854.86 = 42,346.72/x
3. Step 3: Cross multiply
   78,155.80x = 107,854.86 × 42,346.72
4. Step 4: Simplify right side
   78,155.80x = 4,567,299,557.06
5. Step 5: Solve for x
   x = 4,567,299,557.06/78,155.80
6. Step 6: Final answer
   x = 58,438.40