Finding the Fourth Proportional to 1,087.19, 1,499.72 and 645.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.19 : 1,499.72 = 645.01 : x
2. Step 2: Convert to fraction form
   1,087.19/1,499.72 = 645.01/x
3. Step 3: Cross multiply
   1,087.19x = 1,499.72 × 645.01
4. Step 4: Simplify right side
   1,087.19x = 967,327.42
5. Step 5: Solve for x
   x = 967,327.42/1,087.19
6. Step 6: Final answer
   x = 889.75