Finding the Fourth Proportional to 140,564.50, 210,875.91 and 57,458.50

Step by Step Solution

1. Step 1: Write the proportion equation
   140,564.50 : 210,875.91 = 57,458.50 : x
2. Step 2: Convert to fraction form
   140,564.50/210,875.91 = 57,458.50/x
3. Step 3: Cross multiply
   140,564.50x = 210,875.91 × 57,458.50
4. Step 4: Simplify right side
   140,564.50x = 12,116,613,474.74
5. Step 5: Solve for x
   x = 12,116,613,474.74/140,564.50
6. Step 6: Final answer
   x = 86,199.67