Finding the Fourth Proportional to 51,561.36, 77,693.27 and 42,406.47

Step by Step Solution

1. Step 1: Write the proportion equation
   51,561.36 : 77,693.27 = 42,406.47 : x
2. Step 2: Convert to fraction form
   51,561.36/77,693.27 = 42,406.47/x
3. Step 3: Cross multiply
   51,561.36x = 77,693.27 × 42,406.47
4. Step 4: Simplify right side
   51,561.36x = 3,294,697,111.42
5. Step 5: Solve for x
   x = 3,294,697,111.42/51,561.36
6. Step 6: Final answer
   x = 63,898.57