Finding the Fourth Proportional to 1,210.15, 1,670.57 and 930.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.15 : 1,670.57 = 930.29 : x
2. Step 2: Convert to fraction form
   1,210.15/1,670.57 = 930.29/x
3. Step 3: Cross multiply
   1,210.15x = 1,670.57 × 930.29
4. Step 4: Simplify right side
   1,210.15x = 1,554,111.83
5. Step 5: Solve for x
   x = 1,554,111.83/1,210.15
6. Step 6: Final answer
   x = 1,284.23