Finding the Fourth Proportional to 56,141.68, 77,475.36 and 30,991

Step by Step Solution

1. Step 1: Write the proportion equation
   56,141.68 : 77,475.36 = 30,991 : x
2. Step 2: Convert to fraction form
   56,141.68/77,475.36 = 30,991/x
3. Step 3: Cross multiply
   56,141.68x = 77,475.36 × 30,991
4. Step 4: Simplify right side
   56,141.68x = 2,401,038,881.76
5. Step 5: Solve for x
   x = 2,401,038,881.76/56,141.68
6. Step 6: Final answer
   x = 42,767.49