Finding the Fourth Proportional to 78,788.76, 108,727.79 and 42,978.00

Step by Step Solution

1. Step 1: Write the proportion equation
   78,788.76 : 108,727.79 = 42,978.00 : x
2. Step 2: Convert to fraction form
   78,788.76/108,727.79 = 42,978.00/x
3. Step 3: Cross multiply
   78,788.76x = 108,727.79 × 42,978.00
4. Step 4: Simplify right side
   78,788.76x = 4,672,903,208.29
5. Step 5: Solve for x
   x = 4,672,903,208.29/78,788.76
6. Step 6: Final answer
   x = 59,309.26