Finding the Fourth Proportional to 302,022.72, 452,973.60 and 287,035.20

Step by Step Solution

1. Step 1: Write the proportion equation
   302,022.72 : 452,973.60 = 287,035.20 : x
2. Step 2: Convert to fraction form
   302,022.72/452,973.60 = 287,035.20/x
3. Step 3: Cross multiply
   302,022.72x = 452,973.60 × 287,035.20
4. Step 4: Simplify right side
   302,022.72x = 130,019,367,870.72
5. Step 5: Solve for x
   x = 130,019,367,870.72/302,022.72
6. Step 6: Final answer
   x = 430,495.32