Finding the Fourth Proportional to 78,554.61, 108,407.77 and 42,742.49

Step by Step Solution

1. Step 1: Write the proportion equation
   78,554.61 : 108,407.77 = 42,742.49 : x
2. Step 2: Convert to fraction form
   78,554.61/108,407.77 = 42,742.49/x
3. Step 3: Cross multiply
   78,554.61x = 108,407.77 × 42,742.49
4. Step 4: Simplify right side
   78,554.61x = 4,633,617,376.25
5. Step 5: Solve for x
   x = 4,633,617,376.25/78,554.61
6. Step 6: Final answer
   x = 58,985.94