Finding the Fourth Proportional to 13,697.31, 18,897.21 and 10,120.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,697.31 : 18,897.21 = 10,120.89 : x
2. Step 2: Convert to fraction form
   13,697.31/18,897.21 = 10,120.89/x
3. Step 3: Cross multiply
   13,697.31x = 18,897.21 × 10,120.89
4. Step 4: Simplify right side
   13,697.31x = 191,256,583.72
5. Step 5: Solve for x
   x = 191,256,583.72/13,697.31
6. Step 6: Final answer
   x = 13,963.08