Finding the Fourth Proportional to 115,917.30, 159,971.88 and 64,927.05

Step by Step Solution

1. Step 1: Write the proportion equation
   115,917.30 : 159,971.88 = 64,927.05 : x
2. Step 2: Convert to fraction form
   115,917.30/159,971.88 = 64,927.05/x
3. Step 3: Cross multiply
   115,917.30x = 159,971.88 × 64,927.05
4. Step 4: Simplify right side
   115,917.30x = 10,386,501,894.94
5. Step 5: Solve for x
   x = 10,386,501,894.94/115,917.30
6. Step 6: Final answer
   x = 89,602.69