Finding the Fourth Proportional to 139,974.55, 210,048.90 and 56,868.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,974.55 : 210,048.90 = 56,868.55 : x
2. Step 2: Convert to fraction form
   139,974.55/210,048.90 = 56,868.55/x
3. Step 3: Cross multiply
   139,974.55x = 210,048.90 × 56,868.55
4. Step 4: Simplify right side
   139,974.55x = 11,945,175,633.72
5. Step 5: Solve for x
   x = 11,945,175,633.72/139,974.55
6. Step 6: Final answer
   x = 85,338.20