Finding the Fourth Proportional to 78,658.74, 117,768.33 and 42,505.74

Step by Step Solution

1. Step 1: Write the proportion equation
   78,658.74 : 117,768.33 = 42,505.74 : x
2. Step 2: Convert to fraction form
   78,658.74/117,768.33 = 42,505.74/x
3. Step 3: Cross multiply
   78,658.74x = 117,768.33 × 42,505.74
4. Step 4: Simplify right side
   78,658.74x = 5,005,830,015.21
5. Step 5: Solve for x
   x = 5,005,830,015.21/78,658.74
6. Step 6: Final answer
   x = 63,639.84