Finding the Fourth Proportional to 78,555.61, 108,409.15 and 42,743.49

Step by Step Solution

1. Step 1: Write the proportion equation
   78,555.61 : 108,409.15 = 42,743.49 : x
2. Step 2: Convert to fraction form
   78,555.61/108,409.15 = 42,743.49/x
3. Step 3: Cross multiply
   78,555.61x = 108,409.15 × 42,743.49
4. Step 4: Simplify right side
   78,555.61x = 4,633,785,418.93
5. Step 5: Solve for x
   x = 4,633,785,418.93/78,555.61
6. Step 6: Final answer
   x = 58,987.33