Finding the Fourth Proportional to 56,421, 77,860.98 and 31,272.12

Step by Step Solution

1. Step 1: Write the proportion equation
   56,421 : 77,860.98 = 31,272.12 : x
2. Step 2: Convert to fraction form
   56,421/77,860.98 = 31,272.12/x
3. Step 3: Cross multiply
   56,421x = 77,860.98 × 31,272.12
4. Step 4: Simplify right side
   56,421x = 2,434,877,909.88
5. Step 5: Solve for x
   x = 2,434,877,909.88/56,421
6. Step 6: Final answer
   x = 43,155.53