Finding the Fourth Proportional to 115,428, 159,300.36 and 65,136.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,428 : 159,300.36 = 65,136.72 : x
2. Step 2: Convert to fraction form
   115,428/159,300.36 = 65,136.72/x
3. Step 3: Cross multiply
   115,428x = 159,300.36 × 65,136.72
4. Step 4: Simplify right side
   115,428x = 10,376,302,945.22
5. Step 5: Solve for x
   x = 10,376,302,945.22/115,428
6. Step 6: Final answer
   x = 89,894.16