Finding the Fourth Proportional to 89,688, 123,772.73 and 55,715.25

Step by Step Solution

1. Step 1: Write the proportion equation
   89,688 : 123,772.73 = 55,715.25 : x
2. Step 2: Convert to fraction form
   89,688/123,772.73 = 55,715.25/x
3. Step 3: Cross multiply
   89,688x = 123,772.73 × 55,715.25
4. Step 4: Simplify right side
   89,688x = 6,896,028,316.56
5. Step 5: Solve for x
   x = 6,896,028,316.56/89,688
6. Step 6: Final answer
   x = 76,889.09