Finding the Fourth Proportional to 1,606.20, 2,216.52 and 907.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,606.20 : 2,216.52 = 907.56 : x
2. Step 2: Convert to fraction form
   1,606.20/2,216.52 = 907.56/x
3. Step 3: Cross multiply
   1,606.20x = 2,216.52 × 907.56
4. Step 4: Simplify right side
   1,606.20x = 2,011,624.89
5. Step 5: Solve for x
   x = 2,011,624.89/1,606.20
6. Step 6: Final answer
   x = 1,252.41