Finding the Fourth Proportional to 1,645.63, 2,271.18 and 947.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.63 : 2,271.18 = 947.01 : x
2. Step 2: Convert to fraction form
   1,645.63/2,271.18 = 947.01/x
3. Step 3: Cross multiply
   1,645.63x = 2,271.18 × 947.01
4. Step 4: Simplify right side
   1,645.63x = 2,150,830.17
5. Step 5: Solve for x
   x = 2,150,830.17/1,645.63
6. Step 6: Final answer
   x = 1,306.99