Finding the Fourth Proportional to 56,136.76, 77,470.50 and 30,985.72

Step by Step Solution

1. Step 1: Write the proportion equation
   56,136.76 : 77,470.50 = 30,985.72 : x
2. Step 2: Convert to fraction form
   56,136.76/77,470.50 = 30,985.72/x
3. Step 3: Cross multiply
   56,136.76x = 77,470.50 × 30,985.72
4. Step 4: Simplify right side
   56,136.76x = 2,400,479,221.26
5. Step 5: Solve for x
   x = 2,400,479,221.26/56,136.76
6. Step 6: Final answer
   x = 42,761.27