Finding the Fourth Proportional to 56,570.90, 78,071.37 and 31,420.34

Step by Step Solution

1. Step 1: Write the proportion equation
   56,570.90 : 78,071.37 = 31,420.34 : x
2. Step 2: Convert to fraction form
   56,570.90/78,071.37 = 31,420.34/x
3. Step 3: Cross multiply
   56,570.90x = 78,071.37 × 31,420.34
4. Step 4: Simplify right side
   56,570.90x = 2,453,028,989.67
5. Step 5: Solve for x
   x = 2,453,028,989.67/56,570.90
6. Step 6: Final answer
   x = 43,362.03