Finding the Fourth Proportional to 78,215.60, 107,938.12 and 42,406.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,215.60 : 107,938.12 = 42,406.16 : x
2. Step 2: Convert to fraction form
   78,215.60/107,938.12 = 42,406.16/x
3. Step 3: Cross multiply
   78,215.60x = 107,938.12 × 42,406.16
4. Step 4: Simplify right side
   78,215.60x = 4,577,241,186.82
5. Step 5: Solve for x
   x = 4,577,241,186.82/78,215.60
6. Step 6: Final answer
   x = 58,520.82