Finding the Fourth Proportional to 76,725.72, 105,870.47 and 42,729.48

Step by Step Solution

1. Step 1: Write the proportion equation
   76,725.72 : 105,870.47 = 42,729.48 : x
2. Step 2: Convert to fraction form
   76,725.72/105,870.47 = 42,729.48/x
3. Step 3: Cross multiply
   76,725.72x = 105,870.47 × 42,729.48
4. Step 4: Simplify right side
   76,725.72x = 4,523,789,916.81
5. Step 5: Solve for x
   x = 4,523,789,916.81/76,725.72
6. Step 6: Final answer
   x = 58,960.54