Finding the Fourth Proportional to 1,538.40, 2,123.02 and 948.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.40 : 2,123.02 = 948.72 : x
2. Step 2: Convert to fraction form
   1,538.40/2,123.02 = 948.72/x
3. Step 3: Cross multiply
   1,538.40x = 2,123.02 × 948.72
4. Step 4: Simplify right side
   1,538.40x = 2,014,151.53
5. Step 5: Solve for x
   x = 2,014,151.53/1,538.40
6. Step 6: Final answer
   x = 1,309.25