Finding the Fourth Proportional to 1,542.21, 2,128.41 and 912.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.21 : 2,128.41 = 912.93 : x
2. Step 2: Convert to fraction form
   1,542.21/2,128.41 = 912.93/x
3. Step 3: Cross multiply
   1,542.21x = 2,128.41 × 912.93
4. Step 4: Simplify right side
   1,542.21x = 1,943,089.34
5. Step 5: Solve for x
   x = 1,943,089.34/1,542.21
6. Step 6: Final answer
   x = 1,259.94