Finding the Fourth Proportional to 78,240.34, 107,971.72 and 42,430.34

Step by Step Solution

1. Step 1: Write the proportion equation
   78,240.34 : 107,971.72 = 42,430.34 : x
2. Step 2: Convert to fraction form
   78,240.34/107,971.72 = 42,430.34/x
3. Step 3: Cross multiply
   78,240.34x = 107,971.72 × 42,430.34
4. Step 4: Simplify right side
   78,240.34x = 4,581,276,789.98
5. Step 5: Solve for x
   x = 4,581,276,789.98/78,240.34
6. Step 6: Final answer
   x = 58,553.90