Finding the Fourth Proportional to 78,780.17, 108,716.98 and 42,970.95

Step by Step Solution

1. Step 1: Write the proportion equation
   78,780.17 : 108,716.98 = 42,970.95 : x
2. Step 2: Convert to fraction form
   78,780.17/108,716.98 = 42,970.95/x
3. Step 3: Cross multiply
   78,780.17x = 108,716.98 × 42,970.95
4. Step 4: Simplify right side
   78,780.17x = 4,671,671,696.88
5. Step 5: Solve for x
   x = 4,671,671,696.88/78,780.17
6. Step 6: Final answer
   x = 59,300.10