Finding the Fourth Proportional to 76,801.56, 105,986.64 and 42,812.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,801.56 : 105,986.64 = 42,812.21 : x
2. Step 2: Convert to fraction form
   76,801.56/105,986.64 = 42,812.21/x
3. Step 3: Cross multiply
   76,801.56x = 105,986.64 × 42,812.21
4. Step 4: Simplify right side
   76,801.56x = 4,537,521,758.94
5. Step 5: Solve for x
   x = 4,537,521,758.94/76,801.56
6. Step 6: Final answer
   x = 59,081.11