Finding the Fourth Proportional to 10,958.94, 15,123.43 and 10,121.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,958.94 : 15,123.43 = 10,121.80 : x
2. Step 2: Convert to fraction form
   10,958.94/15,123.43 = 10,121.80/x
3. Step 3: Cross multiply
   10,958.94x = 15,123.43 × 10,121.80
4. Step 4: Simplify right side
   10,958.94x = 153,076,333.77
5. Step 5: Solve for x
   x = 153,076,333.77/10,958.94
6. Step 6: Final answer
   x = 13,968.17