Finding the Fourth Proportional to 76,503, 105,544.56 and 56,407.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,503 : 105,544.56 = 56,407.56 : x
2. Step 2: Convert to fraction form
   76,503/105,544.56 = 56,407.56/x
3. Step 3: Cross multiply
   76,503x = 105,544.56 × 56,407.56
4. Step 4: Simplify right side
   76,503x = 5,953,511,100.87
5. Step 5: Solve for x
   x = 5,953,511,100.87/76,503
6. Step 6: Final answer
   x = 77,820.62