Finding the Fourth Proportional to 13,687.59, 18,888.92 and 7,400.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,687.59 : 18,888.92 = 7,400.01 : x
2. Step 2: Convert to fraction form
   13,687.59/18,888.92 = 7,400.01/x
3. Step 3: Cross multiply
   13,687.59x = 18,888.92 × 7,400.01
4. Step 4: Simplify right side
   13,687.59x = 139,778,300.10
5. Step 5: Solve for x
   x = 139,778,300.10/13,687.59
6. Step 6: Final answer
   x = 10,212.04