Finding the Fourth Proportional to 13,693.51, 18,897.03 and 7,405.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,693.51 : 18,897.03 = 7,405.89 : x
2. Step 2: Convert to fraction form
   13,693.51/18,897.03 = 7,405.89/x
3. Step 3: Cross multiply
   13,693.51x = 18,897.03 × 7,405.89
4. Step 4: Simplify right side
   13,693.51x = 139,949,325.51
5. Step 5: Solve for x
   x = 139,949,325.51/13,693.51
6. Step 6: Final answer
   x = 10,220.12