Finding the Fourth Proportional to 139,977.83, 210,053.82 and 56,871.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139,977.83 : 210,053.82 = 56,871.83 : x
2. Step 2: Convert to fraction form
   139,977.83/210,053.82 = 56,871.83/x
3. Step 3: Cross multiply
   139,977.83x = 210,053.82 × 56,871.83
4. Step 4: Simplify right side
   139,977.83x = 11,946,145,667.03
5. Step 5: Solve for x
   x = 11,946,145,667.03/139,977.83
6. Step 6: Final answer
   x = 85,343.13