Finding the Fourth Proportional to 115,281, 159,087.78 and 64,980

Step by Step Solution

1. Step 1: Write the proportion equation
   115,281 : 159,087.78 = 64,980 : x
2. Step 2: Convert to fraction form
   115,281/159,087.78 = 64,980/x
3. Step 3: Cross multiply
   115,281x = 159,087.78 × 64,980
4. Step 4: Simplify right side
   115,281x = 10,337,523,944.40
5. Step 5: Solve for x
   x = 10,337,523,944.40/115,281
6. Step 6: Final answer
   x = 89,672.40