Finding the Fourth Proportional to 1,061.13, 1,464.17 and 641.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.13 : 1,464.17 = 641.20 : x
2. Step 2: Convert to fraction form
   1,061.13/1,464.17 = 641.20/x
3. Step 3: Cross multiply
   1,061.13x = 1,464.17 × 641.20
4. Step 4: Simplify right side
   1,061.13x = 938,822.60
5. Step 5: Solve for x
   x = 938,822.60/1,061.13
6. Step 6: Final answer
   x = 884.74