Finding the Fourth Proportional to 72,901.78, 100,611.60 and 42,685.24

Step by Step Solution

1. Step 1: Write the proportion equation
   72,901.78 : 100,611.60 = 42,685.24 : x
2. Step 2: Convert to fraction form
   72,901.78/100,611.60 = 42,685.24/x
3. Step 3: Cross multiply
   72,901.78x = 100,611.60 × 42,685.24
4. Step 4: Simplify right side
   72,901.78x = 4,294,630,292.78
5. Step 5: Solve for x
   x = 4,294,630,292.78/72,901.78
6. Step 6: Final answer
   x = 58,909.81