Finding the Fourth Proportional to 78,131.51, 107,821.90 and 42,321.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,131.51 : 107,821.90 = 42,321.61 : x
2. Step 2: Convert to fraction form
   78,131.51/107,821.90 = 42,321.61/x
3. Step 3: Cross multiply
   78,131.51x = 107,821.90 × 42,321.61
4. Step 4: Simplify right side
   78,131.51x = 4,563,196,401.26
5. Step 5: Solve for x
   x = 4,563,196,401.26/78,131.51
6. Step 6: Final answer
   x = 58,404.05