Finding the Fourth Proportional to 1,533.10, 2,115.72 and 869.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.10 : 2,115.72 = 869.93 : x
2. Step 2: Convert to fraction form
   1,533.10/2,115.72 = 869.93/x
3. Step 3: Cross multiply
   1,533.10x = 2,115.72 × 869.93
4. Step 4: Simplify right side
   1,533.10x = 1,840,528.30
5. Step 5: Solve for x
   x = 1,840,528.30/1,533.10
6. Step 6: Final answer
   x = 1,200.53