Finding the Fourth Proportional to 61,355.72, 91,978.22 and 42,644.57

Step by Step Solution

1. Step 1: Write the proportion equation
   61,355.72 : 91,978.22 = 42,644.57 : x
2. Step 2: Convert to fraction form
   61,355.72/91,978.22 = 42,644.57/x
3. Step 3: Cross multiply
   61,355.72x = 91,978.22 × 42,644.57
4. Step 4: Simplify right side
   61,355.72x = 3,922,371,641.27
5. Step 5: Solve for x
   x = 3,922,371,641.27/61,355.72
6. Step 6: Final answer
   x = 63,928.38