Finding the Fourth Proportional to 1,538.03, 2,121.61 and 948.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.03 : 2,121.61 = 948.15 : x
2. Step 2: Convert to fraction form
   1,538.03/2,121.61 = 948.15/x
3. Step 3: Cross multiply
   1,538.03x = 2,121.61 × 948.15
4. Step 4: Simplify right side
   1,538.03x = 2,011,604.52
5. Step 5: Solve for x
   x = 2,011,604.52/1,538.03
6. Step 6: Final answer
   x = 1,307.91