Finding the Fourth Proportional to 56,881.40, 78,495.80 and 31,388.00

Step by Step Solution

1. Step 1: Write the proportion equation
   56,881.40 : 78,495.80 = 31,388.00 : x
2. Step 2: Convert to fraction form
   56,881.40/78,495.80 = 31,388.00/x
3. Step 3: Cross multiply
   56,881.40x = 78,495.80 × 31,388.00
4. Step 4: Simplify right side
   56,881.40x = 2,463,825,620.98
5. Step 5: Solve for x
   x = 2,463,825,620.98/56,881.40
6. Step 6: Final answer
   x = 43,315.14