Finding the Fourth Proportional to 78,002.60, 107,643.29 and 42,192.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,002.60 : 107,643.29 = 42,192.60 : x
2. Step 2: Convert to fraction form
   78,002.60/107,643.29 = 42,192.60/x
3. Step 3: Cross multiply
   78,002.60x = 107,643.29 × 42,192.60
4. Step 4: Simplify right side
   78,002.60x = 4,541,750,066.69
5. Step 5: Solve for x
   x = 4,541,750,066.69/78,002.60
6. Step 6: Final answer
   x = 58,225.63