Finding the Fourth Proportional to 1,019.37, 1,528.30 and 402.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.37 : 1,528.30 = 402.76 : x
2. Step 2: Convert to fraction form
   1,019.37/1,528.30 = 402.76/x
3. Step 3: Cross multiply
   1,019.37x = 1,528.30 × 402.76
4. Step 4: Simplify right side
   1,019.37x = 615,538.11
5. Step 5: Solve for x
   x = 615,538.11/1,019.37
6. Step 6: Final answer
   x = 603.84