Finding the Fourth Proportional to 140,611.98, 210,918.76 and 57,505.98

Step by Step Solution

1. Step 1: Write the proportion equation
   140,611.98 : 210,918.76 = 57,505.98 : x
2. Step 2: Convert to fraction form
   140,611.98/210,918.76 = 57,505.98/x
3. Step 3: Cross multiply
   140,611.98x = 210,918.76 × 57,505.98
4. Step 4: Simplify right side
   140,611.98x = 12,129,089,994.18
5. Step 5: Solve for x
   x = 12,129,089,994.18/140,611.98
6. Step 6: Final answer
   x = 86,259.29