Finding the Fourth Proportional to 56,279.07, 77,661.86 and 30,780.34

Step by Step Solution

1. Step 1: Write the proportion equation
   56,279.07 : 77,661.86 = 30,780.34 : x
2. Step 2: Convert to fraction form
   56,279.07/77,661.86 = 30,780.34/x
3. Step 3: Cross multiply
   56,279.07x = 77,661.86 × 30,780.34
4. Step 4: Simplify right side
   56,279.07x = 2,390,458,107.78
5. Step 5: Solve for x
   x = 2,390,458,107.78/56,279.07
6. Step 6: Final answer
   x = 42,475.08