Finding the Fourth Proportional to 23,123.78, 31,911.05 and 12,513.64

Step by Step Solution

1. Step 1: Write the proportion equation
   23,123.78 : 31,911.05 = 12,513.64 : x
2. Step 2: Convert to fraction form
   23,123.78/31,911.05 = 12,513.64/x
3. Step 3: Cross multiply
   23,123.78x = 31,911.05 × 12,513.64
4. Step 4: Simplify right side
   23,123.78x = 399,323,471.50
5. Step 5: Solve for x
   x = 399,323,471.50/23,123.78
6. Step 6: Final answer
   x = 17,268.95