Finding the Fourth Proportional to 1,012.17, 1,507.80 and 981.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.17 : 1,507.80 = 981.57 : x
2. Step 2: Convert to fraction form
   1,012.17/1,507.80 = 981.57/x
3. Step 3: Cross multiply
   1,012.17x = 1,507.80 × 981.57
4. Step 4: Simplify right side
   1,012.17x = 1,480,004.51
5. Step 5: Solve for x
   x = 1,480,004.51/1,012.17
6. Step 6: Final answer
   x = 1,462.21