Finding the Fourth Proportional to 76,800.17, 105,984.72 and 42,810.81

Step by Step Solution

1. Step 1: Write the proportion equation
   76,800.17 : 105,984.72 = 42,810.81 : x
2. Step 2: Convert to fraction form
   76,800.17/105,984.72 = 42,810.81/x
3. Step 3: Cross multiply
   76,800.17x = 105,984.72 × 42,810.81
4. Step 4: Simplify right side
   76,800.17x = 4,537,291,710.82
5. Step 5: Solve for x
   x = 4,537,291,710.82/76,800.17
6. Step 6: Final answer
   x = 59,079.19