Finding the Fourth Proportional to 139,989.98, 210,072.04 and 56,883.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,989.98 : 210,072.04 = 56,883.98 : x
2. Step 2: Convert to fraction form
   139,989.98/210,072.04 = 56,883.98/x
3. Step 3: Cross multiply
   139,989.98x = 210,072.04 × 56,883.98
4. Step 4: Simplify right side
   139,989.98x = 11,949,733,721.92
5. Step 5: Solve for x
   x = 11,949,733,721.92/139,989.98
6. Step 6: Final answer
   x = 85,361.35