Finding the Fourth Proportional to 78,315.61, 108,074.49 and 42,505.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,315.61 : 108,074.49 = 42,505.30 : x
2. Step 2: Convert to fraction form
   78,315.61/108,074.49 = 42,505.30/x
3. Step 3: Cross multiply
   78,315.61x = 108,074.49 × 42,505.30
4. Step 4: Simplify right side
   78,315.61x = 4,593,738,407.27
5. Step 5: Solve for x
   x = 4,593,738,407.27/78,315.61
6. Step 6: Final answer
   x = 58,656.74