Finding the Fourth Proportional to 78,240.42, 107,971.65 and 42,430.35

Step by Step Solution

1. Step 1: Write the proportion equation
   78,240.42 : 107,971.65 = 42,430.35 : x
2. Step 2: Convert to fraction form
   78,240.42/107,971.65 = 42,430.35/x
3. Step 3: Cross multiply
   78,240.42x = 107,971.65 × 42,430.35
4. Step 4: Simplify right side
   78,240.42x = 4,581,274,899.58
5. Step 5: Solve for x
   x = 4,581,274,899.58/78,240.42
6. Step 6: Final answer
   x = 58,553.81