Finding the Fourth Proportional to 72,906.78, 100,618.50 and 42,690.24

Step by Step Solution

1. Step 1: Write the proportion equation
   72,906.78 : 100,618.50 = 42,690.24 : x
2. Step 2: Convert to fraction form
   72,906.78/100,618.50 = 42,690.24/x
3. Step 3: Cross multiply
   72,906.78x = 100,618.50 × 42,690.24
4. Step 4: Simplify right side
   72,906.78x = 4,295,427,913.44
5. Step 5: Solve for x
   x = 4,295,427,913.44/72,906.78
6. Step 6: Final answer
   x = 58,916.71