Finding the Fourth Proportional to 76,881.57, 106,018.94 and 51,387.98

Step by Step Solution

1. Step 1: Write the proportion equation
   76,881.57 : 106,018.94 = 51,387.98 : x
2. Step 2: Convert to fraction form
   76,881.57/106,018.94 = 51,387.98/x
3. Step 3: Cross multiply
   76,881.57x = 106,018.94 × 51,387.98
4. Step 4: Simplify right side
   76,881.57x = 5,448,099,168.34
5. Step 5: Solve for x
   x = 5,448,099,168.34/76,881.57
6. Step 6: Final answer
   x = 70,863.53