Finding the Fourth Proportional to 78,108.61, 107,789.34 and 42,297.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,108.61 : 107,789.34 = 42,297.80 : x
2. Step 2: Convert to fraction form
   78,108.61/107,789.34 = 42,297.80/x
3. Step 3: Cross multiply
   78,108.61x = 107,789.34 × 42,297.80
4. Step 4: Simplify right side
   78,108.61x = 4,559,251,675.98
5. Step 5: Solve for x
   x = 4,559,251,675.98/78,108.61
6. Step 6: Final answer
   x = 58,370.67