Finding the Fourth Proportional to 102,731.84, 154,086.72 and 69,664.16

Step by Step Solution

1. Step 1: Write the proportion equation
   102,731.84 : 154,086.72 = 69,664.16 : x
2. Step 2: Convert to fraction form
   102,731.84/154,086.72 = 69,664.16/x
3. Step 3: Cross multiply
   102,731.84x = 154,086.72 × 69,664.16
4. Step 4: Simplify right side
   102,731.84x = 10,734,321,915.96
5. Step 5: Solve for x
   x = 10,734,321,915.96/102,731.84
6. Step 6: Final answer
   x = 104,488.75