Finding the Fourth Proportional to 1,394.08, 1,921.42 and 1,215.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.08 : 1,921.42 = 1,215.93 : x
2. Step 2: Convert to fraction form
   1,394.08/1,921.42 = 1,215.93/x
3. Step 3: Cross multiply
   1,394.08x = 1,921.42 × 1,215.93
4. Step 4: Simplify right side
   1,394.08x = 2,336,312.22
5. Step 5: Solve for x
   x = 2,336,312.22/1,394.08
6. Step 6: Final answer
   x = 1,675.88