Finding the Fourth Proportional to 143,985.29, 216,009.93 and 55,238.86

Step by Step Solution

1. Step 1: Write the proportion equation
   143,985.29 : 216,009.93 = 55,238.86 : x
2. Step 2: Convert to fraction form
   143,985.29/216,009.93 = 55,238.86/x
3. Step 3: Cross multiply
   143,985.29x = 216,009.93 × 55,238.86
4. Step 4: Simplify right side
   143,985.29x = 11,932,141,201.83
5. Step 5: Solve for x
   x = 11,932,141,201.83/143,985.29
6. Step 6: Final answer
   x = 82,870.56