Finding the Fourth Proportional to 131,499.10, 196,988.82 and 86,991.22

Step by Step Solution

1. Step 1: Write the proportion equation
   131,499.10 : 196,988.82 = 86,991.22 : x
2. Step 2: Convert to fraction form
   131,499.10/196,988.82 = 86,991.22/x
3. Step 3: Cross multiply
   131,499.10x = 196,988.82 × 86,991.22
4. Step 4: Simplify right side
   131,499.10x = 17,136,297,778.16
5. Step 5: Solve for x
   x = 17,136,297,778.16/131,499.10
6. Step 6: Final answer
   x = 130,314.94