Finding the Fourth Proportional to 1,507.21, 2,261.72 and 923.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.21 : 2,261.72 = 923.00 : x
2. Step 2: Convert to fraction form
   1,507.21/2,261.72 = 923.00/x
3. Step 3: Cross multiply
   1,507.21x = 2,261.72 × 923.00
4. Step 4: Simplify right side
   1,507.21x = 2,087,558.56
5. Step 5: Solve for x
   x = 2,087,558.56/1,507.21
6. Step 6: Final answer
   x = 1,385.05