Finding the Fourth Proportional to 139,980.29, 210,012.80 and 50,011.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,980.29 : 210,012.80 = 50,011.20 : x
2. Step 2: Convert to fraction form
   139,980.29/210,012.80 = 50,011.20/x
3. Step 3: Cross multiply
   139,980.29x = 210,012.80 × 50,011.20
4. Step 4: Simplify right side
   139,980.29x = 10,502,991,893.30
5. Step 5: Solve for x
   x = 10,502,991,893.30/139,980.29
6. Step 6: Final answer
   x = 75,031.94