Finding the Fourth Proportional to 56,142, 77,476.10 and 30,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,142 : 77,476.10 = 30,991.50 : x
2. Step 2: Convert to fraction form
   56,142/77,476.10 = 30,991.50/x
3. Step 3: Cross multiply
   56,142x = 77,476.10 × 30,991.50
4. Step 4: Simplify right side
   56,142x = 2,401,100,398.19
5. Step 5: Solve for x
   x = 2,401,100,398.19/56,142
6. Step 6: Final answer
   x = 42,768.34