Finding the Fourth Proportional to 85,607.78, 128,411.31 and 23,278.10

Step by Step Solution

1. Step 1: Write the proportion equation
   85,607.78 : 128,411.31 = 23,278.10 : x
2. Step 2: Convert to fraction form
   85,607.78/128,411.31 = 23,278.10/x
3. Step 3: Cross multiply
   85,607.78x = 128,411.31 × 23,278.10
4. Step 4: Simplify right side
   85,607.78x = 2,989,171,315.31
5. Step 5: Solve for x
   x = 2,989,171,315.31/85,607.78
6. Step 6: Final answer
   x = 34,917.05