Finding the Fourth Proportional to 78,145.30, 107,840.37 and 42,336.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,145.30 : 107,840.37 = 42,336.21 : x
2. Step 2: Convert to fraction form
   78,145.30/107,840.37 = 42,336.21/x
3. Step 3: Cross multiply
   78,145.30x = 107,840.37 × 42,336.21
4. Step 4: Simplify right side
   78,145.30x = 4,565,552,550.80
5. Step 5: Solve for x
   x = 4,565,552,550.80/78,145.30
6. Step 6: Final answer
   x = 58,423.89