Finding the Fourth Proportional to 286,665.72, 429,999.52 and 86,987.76

Step by Step Solution

1. Step 1: Write the proportion equation
   286,665.72 : 429,999.52 = 86,987.76 : x
2. Step 2: Convert to fraction form
   286,665.72/429,999.52 = 86,987.76/x
3. Step 3: Cross multiply
   286,665.72x = 429,999.52 × 86,987.76
4. Step 4: Simplify right side
   286,665.72x = 37,404,695,045.88
5. Step 5: Solve for x
   x = 37,404,695,045.88/286,665.72
6. Step 6: Final answer
   x = 130,481.93