Finding the Fourth Proportional to 23,128.61, 31,918.31 and 13,058.84

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.61 : 31,918.31 = 13,058.84 : x
2. Step 2: Convert to fraction form
   23,128.61/31,918.31 = 13,058.84/x
3. Step 3: Cross multiply
   23,128.61x = 31,918.31 × 13,058.84
4. Step 4: Simplify right side
   23,128.61x = 416,816,070.71
5. Step 5: Solve for x
   x = 416,816,070.71/23,128.61
6. Step 6: Final answer
   x = 18,021.67