Finding the Fourth Proportional to 56,908.89, 78,538.61 and 31,420.16

Step by Step Solution

1. Step 1: Write the proportion equation
   56,908.89 : 78,538.61 = 31,420.16 : x
2. Step 2: Convert to fraction form
   56,908.89/78,538.61 = 31,420.16/x
3. Step 3: Cross multiply
   56,908.89x = 78,538.61 × 31,420.16
4. Step 4: Simplify right side
   56,908.89x = 2,467,695,672.75
5. Step 5: Solve for x
   x = 2,467,695,672.75/56,908.89
6. Step 6: Final answer
   x = 43,362.22