Finding the Fourth Proportional to 28,070.86, 42,128.29 and 19,582.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,070.86 : 42,128.29 = 19,582.15 : x
2. Step 2: Convert to fraction form
   28,070.86/42,128.29 = 19,582.15/x
3. Step 3: Cross multiply
   28,070.86x = 42,128.29 × 19,582.15
4. Step 4: Simplify right side
   28,070.86x = 824,962,445.07
5. Step 5: Solve for x
   x = 824,962,445.07/28,070.86
6. Step 6: Final answer
   x = 29,388.57