Finding the Fourth Proportional to 78,788.61, 108,729.80 and 42,979.93

Step by Step Solution

1. Step 1: Write the proportion equation
   78,788.61 : 108,729.80 = 42,979.93 : x
2. Step 2: Convert to fraction form
   78,788.61/108,729.80 = 42,979.93/x
3. Step 3: Cross multiply
   78,788.61x = 108,729.80 × 42,979.93
4. Step 4: Simplify right side
   78,788.61x = 4,673,199,192.91
5. Step 5: Solve for x
   x = 4,673,199,192.91/78,788.61
6. Step 6: Final answer
   x = 59,313.13