Finding the Fourth Proportional to 98,842.78, 136,412.81 and 56,407.69

Step by Step Solution

1. Step 1: Write the proportion equation
   98,842.78 : 136,412.81 = 56,407.69 : x
2. Step 2: Convert to fraction form
   98,842.78/136,412.81 = 56,407.69/x
3. Step 3: Cross multiply
   98,842.78x = 136,412.81 × 56,407.69
4. Step 4: Simplify right side
   98,842.78x = 7,694,731,498.51
5. Step 5: Solve for x
   x = 7,694,731,498.51/98,842.78
6. Step 6: Final answer
   x = 77,848.19