Finding the Fourth Proportional to 389,080.32, 536,931.78 and 217,009.42

Step by Step Solution

1. Step 1: Write the proportion equation
   389,080.32 : 536,931.78 = 217,009.42 : x
2. Step 2: Convert to fraction form
   389,080.32/536,931.78 = 217,009.42/x
3. Step 3: Cross multiply
   389,080.32x = 536,931.78 × 217,009.42
4. Step 4: Simplify right side
   389,080.32x = 116,519,254,157.37
5. Step 5: Solve for x
   x = 116,519,254,157.37/389,080.32
6. Step 6: Final answer
   x = 299,473.52