Finding the Fourth Proportional to 1,081.30, 1,621.86 and 648.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.30 : 1,621.86 = 648.14 : x
2. Step 2: Convert to fraction form
   1,081.30/1,621.86 = 648.14/x
3. Step 3: Cross multiply
   1,081.30x = 1,621.86 × 648.14
4. Step 4: Simplify right side
   1,081.30x = 1,051,192.34
5. Step 5: Solve for x
   x = 1,051,192.34/1,081.30
6. Step 6: Final answer
   x = 972.16