Finding the Fourth Proportional to 115,430, 159,303.12 and 65,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,430 : 159,303.12 = 65,138.72 : x
2. Step 2: Convert to fraction form
   115,430/159,303.12 = 65,138.72/x
3. Step 3: Cross multiply
   115,430x = 159,303.12 × 65,138.72
4. Step 4: Simplify right side
   115,430x = 10,376,801,328.81
5. Step 5: Solve for x
   x = 10,376,801,328.81/115,430
6. Step 6: Final answer
   x = 89,896.92