Finding the Fourth Proportional to 113,699.88, 156,919.20 and 65,319.12

Step by Step Solution

1. Step 1: Write the proportion equation
   113,699.88 : 156,919.20 = 65,319.12 : x
2. Step 2: Convert to fraction form
   113,699.88/156,919.20 = 65,319.12/x
3. Step 3: Cross multiply
   113,699.88x = 156,919.20 × 65,319.12
4. Step 4: Simplify right side
   113,699.88x = 10,249,824,055.10
5. Step 5: Solve for x
   x = 10,249,824,055.10/113,699.88
6. Step 6: Final answer
   x = 90,148.06