Finding the Fourth Proportional to 56,583.78, 78,085.28 and 30,742.10

Step by Step Solution

1. Step 1: Write the proportion equation
   56,583.78 : 78,085.28 = 30,742.10 : x
2. Step 2: Convert to fraction form
   56,583.78/78,085.28 = 30,742.10/x
3. Step 3: Cross multiply
   56,583.78x = 78,085.28 × 30,742.10
4. Step 4: Simplify right side
   56,583.78x = 2,400,505,486.29
5. Step 5: Solve for x
   x = 2,400,505,486.29/56,583.78
6. Step 6: Final answer
   x = 42,423.92