Finding the Fourth Proportional to 1,670.17, 2,304.78 and 1,006.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,670.17 : 2,304.78 = 1,006.91 : x
2. Step 2: Convert to fraction form
   1,670.17/2,304.78 = 1,006.91/x
3. Step 3: Cross multiply
   1,670.17x = 2,304.78 × 1,006.91
4. Step 4: Simplify right side
   1,670.17x = 2,320,695.72
5. Step 5: Solve for x
   x = 2,320,695.72/1,670.17
6. Step 6: Final answer
   x = 1,389.50