Finding the Fourth Proportional to 56,217, 77,579.67 and 31,066.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,217 : 77,579.67 = 31,066.50 : x
2. Step 2: Convert to fraction form
   56,217/77,579.67 = 31,066.50/x
3. Step 3: Cross multiply
   56,217x = 77,579.67 × 31,066.50
4. Step 4: Simplify right side
   56,217x = 2,410,128,818.06
5. Step 5: Solve for x
   x = 2,410,128,818.06/56,217
6. Step 6: Final answer
   x = 42,871.89