Finding the Fourth Proportional to 287,978.01, 431,965.18 and 98,346.88

Step by Step Solution

1. Step 1: Write the proportion equation
   287,978.01 : 431,965.18 = 98,346.88 : x
2. Step 2: Convert to fraction form
   287,978.01/431,965.18 = 98,346.88/x
3. Step 3: Cross multiply
   287,978.01x = 431,965.18 × 98,346.88
4. Step 4: Simplify right side
   287,978.01x = 42,482,427,721.64
5. Step 5: Solve for x
   x = 42,482,427,721.64/287,978.01
6. Step 6: Final answer
   x = 147,519.69