Finding the Fourth Proportional to 28,172,309.32, 42,272,876.31 and 13,417,109.56

Step by Step Solution

1. Step 1: Write the proportion equation
   28,172,309.32 : 42,272,876.31 = 13,417,109.56 : x
2. Step 2: Convert to fraction form
   28,172,309.32/42,272,876.31 = 13,417,109.56/x
3. Step 3: Cross multiply
   28,172,309.32x = 42,272,876.31 × 13,417,109.56
4. Step 4: Simplify right side
   28,172,309.32x = 567,179,812,867,598.62
5. Step 5: Solve for x
   x = 567,179,812,867,598.62/28,172,309.32
6. Step 6: Final answer
   x = 20,132,528.24