Finding the Fourth Proportional to 216,709.46, 325,005.05 and 64,870.91

Step by Step Solution

1. Step 1: Write the proportion equation
   216,709.46 : 325,005.05 = 64,870.91 : x
2. Step 2: Convert to fraction form
   216,709.46/325,005.05 = 64,870.91/x
3. Step 3: Cross multiply
   216,709.46x = 325,005.05 × 64,870.91
4. Step 4: Simplify right side
   216,709.46x = 21,083,371,398.72
5. Step 5: Solve for x
   x = 21,083,371,398.72/216,709.46
6. Step 6: Final answer
   x = 97,288.65