Finding the Fourth Proportional to 113,609, 156,720.78 and 86,704.64

Step by Step Solution

1. Step 1: Write the proportion equation
   113,609 : 156,720.78 = 86,704.64 : x
2. Step 2: Convert to fraction form
   113,609/156,720.78 = 86,704.64/x
3. Step 3: Cross multiply
   113,609x = 156,720.78 × 86,704.64
4. Step 4: Simplify right side
   113,609x = 13,588,418,810.42
5. Step 5: Solve for x
   x = 13,588,418,810.42/113,609
6. Step 6: Final answer
   x = 119,606.89