Finding the Fourth Proportional to 1,142.07, 1,575.86 and 670.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.07 : 1,575.86 = 670.02 : x
2. Step 2: Convert to fraction form
   1,142.07/1,575.86 = 670.02/x
3. Step 3: Cross multiply
   1,142.07x = 1,575.86 × 670.02
4. Step 4: Simplify right side
   1,142.07x = 1,055,854.37
5. Step 5: Solve for x
   x = 1,055,854.37/1,142.07
6. Step 6: Final answer
   x = 924.51