Finding the Fourth Proportional to 1,145.01, 1,580.09 and 647.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.01 : 1,580.09 = 647.67 : x
2. Step 2: Convert to fraction form
   1,145.01/1,580.09 = 647.67/x
3. Step 3: Cross multiply
   1,145.01x = 1,580.09 × 647.67
4. Step 4: Simplify right side
   1,145.01x = 1,023,376.89
5. Step 5: Solve for x
   x = 1,023,376.89/1,145.01
6. Step 6: Final answer
   x = 893.77