Finding the Fourth Proportional to 285,978.72, 428,971.28 and 86,301

Step by Step Solution

1. Step 1: Write the proportion equation
   285,978.72 : 428,971.28 = 86,301 : x
2. Step 2: Convert to fraction form
   285,978.72/428,971.28 = 86,301/x
3. Step 3: Cross multiply
   285,978.72x = 428,971.28 × 86,301
4. Step 4: Simplify right side
   285,978.72x = 37,020,650,435.28
5. Step 5: Solve for x
   x = 37,020,650,435.28/285,978.72
6. Step 6: Final answer
   x = 129,452.47