Finding the Fourth Proportional to 51,099.29, 77,128.91 and 51,099.29

Step by Step Solution

1. Step 1: Write the proportion equation
   51,099.29 : 77,128.91 = 51,099.29 : x
2. Step 2: Convert to fraction form
   51,099.29/77,128.91 = 51,099.29/x
3. Step 3: Cross multiply
   51,099.29x = 77,128.91 × 51,099.29
4. Step 4: Simplify right side
   51,099.29x = 3,941,231,898.33
5. Step 5: Solve for x
   x = 3,941,231,898.33/51,099.29
6. Step 6: Final answer
   x = 77,128.91