Finding the Fourth Proportional to 1,381.72, 1,905.46 and 1,066.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.72 : 1,905.46 = 1,066.47 : x
2. Step 2: Convert to fraction form
   1,381.72/1,905.46 = 1,066.47/x
3. Step 3: Cross multiply
   1,381.72x = 1,905.46 × 1,066.47
4. Step 4: Simplify right side
   1,381.72x = 2,032,110.59
5. Step 5: Solve for x
   x = 2,032,110.59/1,381.72
6. Step 6: Final answer
   x = 1,470.72