Finding the Fourth Proportional to 56,885.62, 78,523.68 and 42,779.20

Step by Step Solution

1. Step 1: Write the proportion equation
   56,885.62 : 78,523.68 = 42,779.20 : x
2. Step 2: Convert to fraction form
   56,885.62/78,523.68 = 42,779.20/x
3. Step 3: Cross multiply
   56,885.62x = 78,523.68 × 42,779.20
4. Step 4: Simplify right side
   56,885.62x = 3,359,180,211.46
5. Step 5: Solve for x
   x = 3,359,180,211.46/56,885.62
6. Step 6: Final answer
   x = 59,051.48