Finding the Fourth Proportional to 56,149, 77,485.70 and 30,998.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,149 : 77,485.70 = 30,998.50 : x
2. Step 2: Convert to fraction form
   56,149/77,485.70 = 30,998.50/x
3. Step 3: Cross multiply
   56,149x = 77,485.70 × 30,998.50
4. Step 4: Simplify right side
   56,149x = 2,401,940,471.45
5. Step 5: Solve for x
   x = 2,401,940,471.45/56,149
6. Step 6: Final answer
   x = 42,777.97