Finding the Fourth Proportional to 72,176.56, 99,594.95 and 39,906.81

Step by Step Solution

1. Step 1: Write the proportion equation
   72,176.56 : 99,594.95 = 39,906.81 : x
2. Step 2: Convert to fraction form
   72,176.56/99,594.95 = 39,906.81/x
3. Step 3: Cross multiply
   72,176.56x = 99,594.95 × 39,906.81
4. Step 4: Simplify right side
   72,176.56x = 3,974,516,746.61
5. Step 5: Solve for x
   x = 3,974,516,746.61/72,176.56
6. Step 6: Final answer
   x = 55,066.59