Finding the Fourth Proportional to 56,619, 78,136.65 and 31,468.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,619 : 78,136.65 = 31,468.50 : x
2. Step 2: Convert to fraction form
   56,619/78,136.65 = 31,468.50/x
3. Step 3: Cross multiply
   56,619x = 78,136.65 × 31,468.50
4. Step 4: Simplify right side
   56,619x = 2,458,843,170.53
5. Step 5: Solve for x
   x = 2,458,843,170.53/56,619
6. Step 6: Final answer
   x = 43,427.88