Finding the Fourth Proportional to 78,779.92, 108,716.63 and 42,970.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,779.92 : 108,716.63 = 42,970.70 : x
2. Step 2: Convert to fraction form
   78,779.92/108,716.63 = 42,970.70/x
3. Step 3: Cross multiply
   78,779.92x = 108,716.63 × 42,970.70
4. Step 4: Simplify right side
   78,779.92x = 4,671,629,585.31
5. Step 5: Solve for x
   x = 4,671,629,585.31/78,779.92
6. Step 6: Final answer
   x = 59,299.75