Finding the Fourth Proportional to 1,061.77, 1,464.64 and 641.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.77 : 1,464.64 = 641.99 : x
2. Step 2: Convert to fraction form
   1,061.77/1,464.64 = 641.99/x
3. Step 3: Cross multiply
   1,061.77x = 1,464.64 × 641.99
4. Step 4: Simplify right side
   1,061.77x = 940,284.23
5. Step 5: Solve for x
   x = 940,284.23/1,061.77
6. Step 6: Final answer
   x = 885.58