Finding the Fourth Proportional to 78,144.30, 107,838.99 and 42,335.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,144.30 : 107,838.99 = 42,335.21 : x
2. Step 2: Convert to fraction form
   78,144.30/107,838.99 = 42,335.21/x
3. Step 3: Cross multiply
   78,144.30x = 107,838.99 × 42,335.21
4. Step 4: Simplify right side
   78,144.30x = 4,565,385,748.64
5. Step 5: Solve for x
   x = 4,565,385,748.64/78,144.30
6. Step 6: Final answer
   x = 58,422.50