Finding the Fourth Proportional to 116,665.72, 160,988.37 and 64,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   116,665.72 : 160,988.37 = 64,978.88 : x
2. Step 2: Convert to fraction form
   116,665.72/160,988.37 = 64,978.88/x
3. Step 3: Cross multiply
   116,665.72x = 160,988.37 × 64,978.88
4. Step 4: Simplify right side
   116,665.72x = 10,460,842,927.01
5. Step 5: Solve for x
   x = 10,460,842,927.01/116,665.72
6. Step 6: Final answer
   x = 89,665.09