Finding the Fourth Proportional to 158,051.61, 218,111.09 and 86,431.61

Step by Step Solution

1. Step 1: Write the proportion equation
   158,051.61 : 218,111.09 = 86,431.61 : x
2. Step 2: Convert to fraction form
   158,051.61/218,111.09 = 86,431.61/x
3. Step 3: Cross multiply
   158,051.61x = 218,111.09 × 86,431.61
4. Step 4: Simplify right side
   158,051.61x = 18,851,692,667.55
5. Step 5: Solve for x
   x = 18,851,692,667.55/158,051.61
6. Step 6: Final answer
   x = 119,275.55