Finding the Fourth Proportional to 76,859, 106,152.90 and 51,664.76

Step by Step Solution

1. Step 1: Write the proportion equation
   76,859 : 106,152.90 = 51,664.76 : x
2. Step 2: Convert to fraction form
   76,859/106,152.90 = 51,664.76/x
3. Step 3: Cross multiply
   76,859x = 106,152.90 × 51,664.76
4. Step 4: Simplify right side
   76,859x = 5,484,364,101.80
5. Step 5: Solve for x
   x = 5,484,364,101.80/76,859
6. Step 6: Final answer
   x = 71,356.17