Finding the Fourth Proportional to 56,401.55, 77,835.35 and 30,909.77

Step by Step Solution

1. Step 1: Write the proportion equation
   56,401.55 : 77,835.35 = 30,909.77 : x
2. Step 2: Convert to fraction form
   56,401.55/77,835.35 = 30,909.77/x
3. Step 3: Cross multiply
   56,401.55x = 77,835.35 × 30,909.77
4. Step 4: Simplify right side
   56,401.55x = 2,405,872,766.37
5. Step 5: Solve for x
   x = 2,405,872,766.37/56,401.55
6. Step 6: Final answer
   x = 42,656.15