Finding the Fourth Proportional to 103,991.55, 143,507.90 and 56,244.78

Step by Step Solution

1. Step 1: Write the proportion equation
   103,991.55 : 143,507.90 = 56,244.78 : x
2. Step 2: Convert to fraction form
   103,991.55/143,507.90 = 56,244.78/x
3. Step 3: Cross multiply
   103,991.55x = 143,507.90 × 56,244.78
4. Step 4: Simplify right side
   103,991.55x = 8,071,570,404.37
5. Step 5: Solve for x
   x = 8,071,570,404.37/103,991.55
6. Step 6: Final answer
   x = 77,617.56