Finding the Fourth Proportional to 1,434.02, 1,978.93 and 812.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.02 : 1,978.93 = 812.98 : x
2. Step 2: Convert to fraction form
   1,434.02/1,978.93 = 812.98/x
3. Step 3: Cross multiply
   1,434.02x = 1,978.93 × 812.98
4. Step 4: Simplify right side
   1,434.02x = 1,608,830.51
5. Step 5: Solve for x
   x = 1,608,830.51/1,434.02
6. Step 6: Final answer
   x = 1,121.90