Finding the Fourth Proportional to 78,492.30, 108,321.42 and 42,684.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,492.30 : 108,321.42 = 42,684.40 : x
2. Step 2: Convert to fraction form
   78,492.30/108,321.42 = 42,684.40/x
3. Step 3: Cross multiply
   78,492.30x = 108,321.42 × 42,684.40
4. Step 4: Simplify right side
   78,492.30x = 4,623,634,819.85
5. Step 5: Solve for x
   x = 4,623,634,819.85/78,492.30
6. Step 6: Final answer
   x = 58,905.58