Finding the Fourth Proportional to 78,620.64, 108,492.78 and 42,810.54

Step by Step Solution

1. Step 1: Write the proportion equation
   78,620.64 : 108,492.78 = 42,810.54 : x
2. Step 2: Convert to fraction form
   78,620.64/108,492.78 = 42,810.54/x
3. Step 3: Cross multiply
   78,620.64x = 108,492.78 × 42,810.54
4. Step 4: Simplify right side
   78,620.64x = 4,644,634,861.86
5. Step 5: Solve for x
   x = 4,644,634,861.86/78,620.64
6. Step 6: Final answer
   x = 59,076.53