Finding the Fourth Proportional to 1,091.98, 1,638.51 and 948.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.98 : 1,638.51 = 948.34 : x
2. Step 2: Convert to fraction form
   1,091.98/1,638.51 = 948.34/x
3. Step 3: Cross multiply
   1,091.98x = 1,638.51 × 948.34
4. Step 4: Simplify right side
   1,091.98x = 1,553,864.57
5. Step 5: Solve for x
   x = 1,553,864.57/1,091.98
6. Step 6: Final answer
   x = 1,422.98